Alternative Light Source is the third album by the English electronic group Leftfield, released on 8 June 2015.

It is also the first Leftfield album without Paul Daley, as well as the first since the band's return in 2010.

On 1 June 2015, the album premiere was streamed live on Leftfield's website, coupled with live tweeting about it on the band's Twitter feed with hashtag #leftfieldstream.

[12] Nick Annan of Clash said "Alternative Light Source is a worthy successor to Rhythm & Stealth, not as sparse or hard hitting but brimming with energy, ideas and familiar Leftfield diaphragm-rattling bass.

"[3] Mojo's Stephen Worthy commented that Neil Barnes "meets the challenge" of releasing a followup to Leftfield's previous albums that went platinum, and said that the album, "...aided by a clutch of judicious guest appearances, balances crowd-pleasing festival epics, intense techy workouts and bubbling synth lullabies.